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Research Article | Open Access

Effect of temperature and mating pair on tribological properties of DLC and GLC coatings under high pressure lubricated by MoDTC and ZDDP

Kang LIU1, Jia-jie KANG1,2,3( ), Guang-an ZHANG4( ), Zhi-bin LU4, Wen YUE1,2,3
School of Engineering and Technology, China University of Geosciences (Beijing), Beijing 100083, China
Key Laboratory of Deep GeoDrilling Technology of Ministry of Natural Resources, Beijing 100083, China
Zhengzhou Institute, China University of Geosciences (Beijing), Zhengzhou 451283, China
State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China
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Abstract

Diamond-like carbon (DLC) and graphite-like carbon (GLC) coatings have good prospects for improving the surface properties of engine parts. However, further understanding is needed on the effect of working conditions on tribological behaviors. In this study, GLC and two types of DLC coatings were deposited on GCr15 substrate for investigation. The friction and wear properties of self-mated and steel-mated pairs were evaluated. Two temperatures (25 and 90 ℃), three lubrication conditions (base oil, molybdenum dithiocarbamate (MoDTC)-containing oil, MoDTC+zinc dialkyldithiophosphate (ZDDP)-containing oil), and high Hertz contact stress (2.41 GPa) were applied in the experiments. The results showed that high temperature promoted the effect of ZDDP on steel-mated pairs, but increased wear under base oil lubrication. The increased wear for steel-mated pairs lubricated by MoDTC-containing oil was due to abrasive wear probably caused by MoO3 and β-FeMoO4. It was also found that in most cases, the tribological properties of self-mated pairs were better than those of steel-mated pairs.

Keywords

diamond-like carbon (DLC)graphite-like carbon (GLC)mating pairtemperatureoil additives

References

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Friction
Volume 9 Issue 6,
December 2021
Pages 1390-1405
DOI: 10.1007/s40544-020-0420-1

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LIU K, KANG J-j, ZHANG G-a, et al. Effect of temperature and mating pair on tribological properties of DLC and GLC coatings under high pressure lubricated by MoDTC and ZDDP. Friction, 2021, 9(6): 1390-1405. https://doi.org/10.1007/s40544-020-0420-1

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Received: 02 March 2020
Revised: 05 May 2020
Accepted: 14 June 2020
Published: 23 November 2020
© The author(s) 2020

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